Once I wrote some JUnit tests for a framework which referenced GUI components in the model. No worries on my development machine - but as I moved those tests to the test server I’ve got that bloody HeadlessException. At this very moment I felt a bit headless too.
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During the service hot swap mechanism development of NetServe I run into the problem that jar files getting locked by the JRE under Windows.
After some research I found a simple solution for this problem (maybe it’s a performance issue). Before you instanciate a custom classloader you have to disable caching on the URL.
URL[] urls = new URL[1]; urls[0] = new URL(“/path/to/my.jar”); url.openConnection().setDefaultUseCaches(false); ClassLoader cl = new URLClassLoader(urls);
After that, your jar’s won’t get locked.